/**
 * Shared keyboard handler for transform gizmo controls.
 * Handles common shortcuts: Q (space), +/- (size), X/Y/Z (axis), Space (enable).
 * Returns true if the key was handled (caller should mark dirty / dispatch change).
 */
export declare function handleGizmoKeyDown(event: KeyboardEvent, callbacks: {
    toggleSpace: () => void;
    adjustSize: (delta: number) => void;
    toggleAxis: (axis: 0 | 1 | 2) => void;
    toggleEnabled: () => void;
}): boolean;
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